[DeTomaso] Tire pressure

[Pantdino]

I think Julian is right here--  even though modern tires have steel belts under the tread they will still bend some-- they are not like solid steel bands.  So if you mount the tire on a rim that is too narrow for it it will bow in the tread area, putting more force on the road in the middle of the tread.

I am 99% sure there was a post in the past where someone said using 35psi or similar with 335 tires on 11" wheels led to very rapid tire wear in the center and they found that somewhere in the low 20's solved the problem.

I remember because that seemed like a very low pressure to be running and simply proved to my mind that the rim was too narrow.  I run 285s on 10" rims on my car (with 215 fronts)-- looks macho enough for me. .

Jim






-----Original Message-----
From: Tomas Gunnarsson <guson at home.se>
To: Thomas Tornblom <Thomas.Tornblom at hax.se>; detomaso at realbig.com
Sent: Sat, Mar 26, 2011 9:34 am
Subject: Re: [DeTomaso] Tire pressure


>From an engineering point of view I can't see how 2 vs 3 bar can make any
oticable difference in how much the center of the tread expands at speed.
hat keeps the tire from balooning is the cords inside the tire, not how
uch the sidewalls pull on the tread edges. Remember that the air pressure
n the tread section also increases when you raise the tire pressure. An
nflated inner tube shows you what happens when rubber and air are left on
heir own to decide what shape to assume.
Tomas
-----Original Message-----
rom: detomaso-bounces at realbig.com
mailto:detomaso-bounces at realbig.com]On Behalf Of Thomas Tornblom
ent: den 26 mars 2011 17:15
o: detomaso at realbig.com
ubject: Re: [DeTomaso] Tire pressure

he owners manual specifies 37 psi front and 40 psi rear for the GT5, or
.6 and 2.8 bar, and this is what I run, and they wear even. I have
okohama AVS1 tires front and rear.
Two tire shops I've visited says that running these wide tires with too
ow pressure will make them wear prematurely in the center from the
entrifugal forces.
Thomas
2011-03-26 16:23, Julian Kift skrev:

 I have to disgaree to part of that statement; 35 psi is the pressure 'per
quare inch' so is independent of tire size. The issue is more likely that
he tire is too wide for the rim size creating bowing in the tread center at
5 psi which is now being compensated for by reduced pressure, two different
cenarios IMO.

 Julian

> From: MikeLDrew at aol.com
> Date: Sat, 26 Mar 2011 01:59:50 -0400
> To: michaelsavga at gmail.com; pantdino at aol.com
> CC: detomaso at realbig.com
> Subject: Re: [DeTomaso] Tire pressure
>
>
> In a message dated 3/22/11 19 32 49, michaelsavga at gmail.com writes:
>
>
>> for some reason, my rears seem to wear out prematurely anyway.   I keep
>> 335/35/17&  245/40/17. at 35 psi (cold).  Now that i have Kimbo, i
oping
>> for half the tread life and twice the fun.
>>
>
> They probably wear out prematurely in the center, no? 35 psi cold is way
> high for tires that big, in the rear anyway.
>
> Lori was running 32 psi in hers, and she developed premature wear in the
> center on the rears. She recently dropped the rears to 28, but only has a
> few miles on them since then.
>
> Mike
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